Metal cords for rubber reinforcement and tires using the same

Abstract

A metal cord usable for the reinforcement of rubber articles is comprised of a helically formed single wire filament having a twisting angle of 75-84.5 degrees or a bundle of two twisted metal filaments each having a twisting angle of 75-84.5 degrees. Such metal cords are preferably used as a rubber reinforcement in each part of a pneumatic tire.

What is claimed is: 
     
       1. A metal cord formed by twisting two metal filaments at the same pitch, characterized in that a twisting angle α 1  is represented by an equation (1) of 75°≦α 1  ≦84.5° and said filaments are contacted with each other at two positions per one twisting pitch. 
     
     
       2. The metal cord according to claim 1, wherein said filament has a filament diameter of 0.15-0.8 mm. 
     
     
       3. The metal cord according to claim 2, wherein said filament diameter is 0.20-0.6 mm.